三角形: 三角形内角和为180度.
Triangles: The sum of the interior angles of a triangle is 180 degrees.
只有在平坦的宇宙中，空间才符合标准的几何规律——三角形的内角和精确地等于180度，平行线永远不相交。
Only in a flat universe does space obey all the standard geometry-class rules-the angles of a triangle add up to exactly 180 degrees and parallel lines never meet.
在局部三角化中考虑了三角形内角和顶点距离，采用规格化最小顶点距离法实现局部三角化，避免了狭长三角形出现。
A new re-triangulation method based on normalized minimum-vertex-distance was presented to avoid long and thin triangles, and it considered the vertex distance and the interior Angle of triangle.
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